Important: To ensure your booking solution continues working seamlessly, action is required before October 1, 2026.
Microsoft has confirmed that Exchange Web Services (EWS) will be retired for Exchange Online and Microsoft 365 on October 1, 2026. From this date, all EWS requests from non-Microsoft applications will be blocked.
If you are still using the EWS version of Sign In Solutions/Pronestor Planner product, action is required. Once EWS is disabled, calendar synchronisation and booking management will no longer function.
The benefits once you move over to our Microsoft Graph version:
Microsoft Graph is Microsoft's modern, fully supported API and offers several advantages:
Secure OAuth 2.0 authentication
Fine-grained permission controls
Improved reliability and performance
Better monitoring and logging
Ongoing compatibility with Microsoft 365 and future Microsoft features
Moving is essential for the following reasons:
EWS retirement: Microsoft will permanently block EWS access on October 1, 2026. EWS will no longer be available after this date, making migration essential.
New Outlook requirement: Microsoft’s New Outlook experience is only supported through Microsoft Graph. Customers wishing to adopt or continue using New Outlook must migrate.
Future support: Microsoft has ended feature development for EWS and is investing exclusively in Microsoft Graph. Going forward, our product will be fully supported on our Microsoft Graph version.
Start your migration today
To begin migrating from EWS to Microsoft Graph, please contact us:
Email: [email protected]
Planner Web: Use the in-app chat bubble
Please quote “EWS to Graph migration” so our team can start the process of moving you over.
We strongly recommend beginning this transition as soon as possible to avoid disruption ahead of Microsoft’s October 1, 2026, deadline.